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![Zhang Qilong](/assets/img/avatar_default.png)
pm_runtime_get_sync() will increment pm usage at first and it
will resume the device later. We should decrease the usage count
whetever it succeeded or failed(maybe runtime of the device has
error, or device is in inaccessible state, or other error state).
If we do not call put operation to decrease the reference, it will
result in reference leak in xhci_histb_probe. Moreover, this
device cannot enter the idle state and always stay busy or other
non-idle state later. So we fixed it by jumping to error handling
branch.
Fixes: c508f41da0
("xhci: hisilicon: support HiSilicon STB xHCI host controller")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201106122221.2304528-1-zhangqilong3@huawei.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
411 lines
9.6 KiB
C
411 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* xHCI host controller driver for HiSilicon STB SoCs
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*
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* Copyright (C) 2017-2018 HiSilicon Co., Ltd. http://www.hisilicon.com
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*
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* Authors: Jianguo Sun <sunjianguo1@huawei.com>
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/reset.h>
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#include "xhci.h"
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#define GTXTHRCFG 0xc108
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#define GRXTHRCFG 0xc10c
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#define REG_GUSB2PHYCFG0 0xc200
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#define BIT_UTMI_8_16 BIT(3)
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#define BIT_UTMI_ULPI BIT(4)
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#define BIT_FREECLK_EXIST BIT(30)
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#define REG_GUSB3PIPECTL0 0xc2c0
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#define USB3_DEEMPHASIS_MASK GENMASK(2, 1)
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#define USB3_DEEMPHASIS0 BIT(1)
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#define USB3_TX_MARGIN1 BIT(4)
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struct xhci_hcd_histb {
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struct device *dev;
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struct usb_hcd *hcd;
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void __iomem *ctrl;
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struct clk *bus_clk;
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struct clk *utmi_clk;
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struct clk *pipe_clk;
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struct clk *suspend_clk;
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struct reset_control *soft_reset;
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};
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static inline struct xhci_hcd_histb *hcd_to_histb(struct usb_hcd *hcd)
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{
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return dev_get_drvdata(hcd->self.controller);
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}
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static int xhci_histb_config(struct xhci_hcd_histb *histb)
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{
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struct device_node *np = histb->dev->of_node;
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u32 regval;
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if (of_property_match_string(np, "phys-names", "inno") >= 0) {
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/* USB2 PHY chose ulpi 8bit interface */
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regval = readl(histb->ctrl + REG_GUSB2PHYCFG0);
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regval &= ~BIT_UTMI_ULPI;
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regval &= ~(BIT_UTMI_8_16);
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regval &= ~BIT_FREECLK_EXIST;
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writel(regval, histb->ctrl + REG_GUSB2PHYCFG0);
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}
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if (of_property_match_string(np, "phys-names", "combo") >= 0) {
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/*
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* write 0x010c0012 to GUSB3PIPECTL0
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* GUSB3PIPECTL0[5:3] = 010 : Tx Margin = 900mV ,
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* decrease TX voltage
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* GUSB3PIPECTL0[2:1] = 01 : Tx Deemphasis = -3.5dB,
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* refer to xHCI spec
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*/
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regval = readl(histb->ctrl + REG_GUSB3PIPECTL0);
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regval &= ~USB3_DEEMPHASIS_MASK;
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regval |= USB3_DEEMPHASIS0;
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regval |= USB3_TX_MARGIN1;
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writel(regval, histb->ctrl + REG_GUSB3PIPECTL0);
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}
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writel(0x23100000, histb->ctrl + GTXTHRCFG);
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writel(0x23100000, histb->ctrl + GRXTHRCFG);
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return 0;
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}
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static int xhci_histb_clks_get(struct xhci_hcd_histb *histb)
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{
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struct device *dev = histb->dev;
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histb->bus_clk = devm_clk_get(dev, "bus");
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if (IS_ERR(histb->bus_clk)) {
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dev_err(dev, "fail to get bus clk\n");
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return PTR_ERR(histb->bus_clk);
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}
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histb->utmi_clk = devm_clk_get(dev, "utmi");
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if (IS_ERR(histb->utmi_clk)) {
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dev_err(dev, "fail to get utmi clk\n");
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return PTR_ERR(histb->utmi_clk);
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}
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histb->pipe_clk = devm_clk_get(dev, "pipe");
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if (IS_ERR(histb->pipe_clk)) {
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dev_err(dev, "fail to get pipe clk\n");
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return PTR_ERR(histb->pipe_clk);
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}
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histb->suspend_clk = devm_clk_get(dev, "suspend");
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if (IS_ERR(histb->suspend_clk)) {
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dev_err(dev, "fail to get suspend clk\n");
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return PTR_ERR(histb->suspend_clk);
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}
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return 0;
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}
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static int xhci_histb_host_enable(struct xhci_hcd_histb *histb)
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{
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int ret;
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ret = clk_prepare_enable(histb->bus_clk);
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if (ret) {
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dev_err(histb->dev, "failed to enable bus clk\n");
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return ret;
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}
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ret = clk_prepare_enable(histb->utmi_clk);
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if (ret) {
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dev_err(histb->dev, "failed to enable utmi clk\n");
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goto err_utmi_clk;
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}
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ret = clk_prepare_enable(histb->pipe_clk);
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if (ret) {
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dev_err(histb->dev, "failed to enable pipe clk\n");
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goto err_pipe_clk;
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}
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ret = clk_prepare_enable(histb->suspend_clk);
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if (ret) {
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dev_err(histb->dev, "failed to enable suspend clk\n");
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goto err_suspend_clk;
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}
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reset_control_deassert(histb->soft_reset);
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return 0;
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err_suspend_clk:
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clk_disable_unprepare(histb->pipe_clk);
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err_pipe_clk:
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clk_disable_unprepare(histb->utmi_clk);
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err_utmi_clk:
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clk_disable_unprepare(histb->bus_clk);
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return ret;
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}
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static void xhci_histb_host_disable(struct xhci_hcd_histb *histb)
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{
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reset_control_assert(histb->soft_reset);
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clk_disable_unprepare(histb->suspend_clk);
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clk_disable_unprepare(histb->pipe_clk);
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clk_disable_unprepare(histb->utmi_clk);
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clk_disable_unprepare(histb->bus_clk);
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}
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static void xhci_histb_quirks(struct device *dev, struct xhci_hcd *xhci)
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{
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/*
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* As of now platform drivers don't provide MSI support so we ensure
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* here that the generic code does not try to make a pci_dev from our
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* dev struct in order to setup MSI
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*/
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xhci->quirks |= XHCI_PLAT;
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}
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/* called during probe() after chip reset completes */
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static int xhci_histb_setup(struct usb_hcd *hcd)
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{
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struct xhci_hcd_histb *histb = hcd_to_histb(hcd);
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int ret;
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if (usb_hcd_is_primary_hcd(hcd)) {
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ret = xhci_histb_config(histb);
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if (ret)
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return ret;
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}
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return xhci_gen_setup(hcd, xhci_histb_quirks);
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}
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static const struct xhci_driver_overrides xhci_histb_overrides __initconst = {
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.reset = xhci_histb_setup,
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};
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static struct hc_driver __read_mostly xhci_histb_hc_driver;
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static int xhci_histb_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct xhci_hcd_histb *histb;
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const struct hc_driver *driver;
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struct usb_hcd *hcd;
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struct xhci_hcd *xhci;
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struct resource *res;
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int irq;
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int ret = -ENODEV;
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if (usb_disabled())
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return -ENODEV;
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driver = &xhci_histb_hc_driver;
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histb = devm_kzalloc(dev, sizeof(*histb), GFP_KERNEL);
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if (!histb)
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return -ENOMEM;
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histb->dev = dev;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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histb->ctrl = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
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if (IS_ERR(histb->ctrl))
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return PTR_ERR(histb->ctrl);
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ret = xhci_histb_clks_get(histb);
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if (ret)
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return ret;
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histb->soft_reset = devm_reset_control_get(dev, "soft");
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if (IS_ERR(histb->soft_reset)) {
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dev_err(dev, "failed to get soft reset\n");
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return PTR_ERR(histb->soft_reset);
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}
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pm_runtime_enable(dev);
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pm_runtime_get_sync(dev);
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device_enable_async_suspend(dev);
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/* Initialize dma_mask and coherent_dma_mask to 32-bits */
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ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
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if (ret)
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goto disable_pm;
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hcd = usb_create_hcd(driver, dev, dev_name(dev));
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if (!hcd) {
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ret = -ENOMEM;
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goto disable_pm;
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}
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hcd->regs = histb->ctrl;
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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histb->hcd = hcd;
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dev_set_drvdata(hcd->self.controller, histb);
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ret = xhci_histb_host_enable(histb);
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if (ret)
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goto put_hcd;
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xhci = hcd_to_xhci(hcd);
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device_wakeup_enable(hcd->self.controller);
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xhci->main_hcd = hcd;
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xhci->shared_hcd = usb_create_shared_hcd(driver, dev, dev_name(dev),
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hcd);
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if (!xhci->shared_hcd) {
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ret = -ENOMEM;
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goto disable_host;
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}
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if (device_property_read_bool(dev, "usb2-lpm-disable"))
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xhci->quirks |= XHCI_HW_LPM_DISABLE;
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if (device_property_read_bool(dev, "usb3-lpm-capable"))
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xhci->quirks |= XHCI_LPM_SUPPORT;
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/* imod_interval is the interrupt moderation value in nanoseconds. */
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xhci->imod_interval = 40000;
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device_property_read_u32(dev, "imod-interval-ns",
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&xhci->imod_interval);
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ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (ret)
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goto put_usb3_hcd;
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if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
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xhci->shared_hcd->can_do_streams = 1;
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ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
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if (ret)
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goto dealloc_usb2_hcd;
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device_enable_async_suspend(dev);
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pm_runtime_put_noidle(dev);
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/*
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* Prevent runtime pm from being on as default, users should enable
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* runtime pm using power/control in sysfs.
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*/
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pm_runtime_forbid(dev);
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return 0;
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dealloc_usb2_hcd:
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usb_remove_hcd(hcd);
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put_usb3_hcd:
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usb_put_hcd(xhci->shared_hcd);
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disable_host:
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xhci_histb_host_disable(histb);
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put_hcd:
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usb_put_hcd(hcd);
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disable_pm:
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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return ret;
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}
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static int xhci_histb_remove(struct platform_device *dev)
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{
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struct xhci_hcd_histb *histb = platform_get_drvdata(dev);
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struct usb_hcd *hcd = histb->hcd;
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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struct usb_hcd *shared_hcd = xhci->shared_hcd;
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xhci->xhc_state |= XHCI_STATE_REMOVING;
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usb_remove_hcd(shared_hcd);
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xhci->shared_hcd = NULL;
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device_wakeup_disable(&dev->dev);
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usb_remove_hcd(hcd);
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usb_put_hcd(shared_hcd);
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xhci_histb_host_disable(histb);
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usb_put_hcd(hcd);
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pm_runtime_put_sync(&dev->dev);
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pm_runtime_disable(&dev->dev);
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return 0;
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}
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static int __maybe_unused xhci_histb_suspend(struct device *dev)
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{
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struct xhci_hcd_histb *histb = dev_get_drvdata(dev);
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struct usb_hcd *hcd = histb->hcd;
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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int ret;
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ret = xhci_suspend(xhci, device_may_wakeup(dev));
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if (!device_may_wakeup(dev))
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xhci_histb_host_disable(histb);
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return ret;
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}
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static int __maybe_unused xhci_histb_resume(struct device *dev)
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{
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struct xhci_hcd_histb *histb = dev_get_drvdata(dev);
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struct usb_hcd *hcd = histb->hcd;
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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if (!device_may_wakeup(dev))
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xhci_histb_host_enable(histb);
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return xhci_resume(xhci, 0);
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}
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static const struct dev_pm_ops xhci_histb_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(xhci_histb_suspend, xhci_histb_resume)
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};
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#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_histb_pm_ops : NULL)
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#ifdef CONFIG_OF
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static const struct of_device_id histb_xhci_of_match[] = {
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{ .compatible = "hisilicon,hi3798cv200-xhci"},
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{ },
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};
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MODULE_DEVICE_TABLE(of, histb_xhci_of_match);
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#endif
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static struct platform_driver histb_xhci_driver = {
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.probe = xhci_histb_probe,
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.remove = xhci_histb_remove,
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.driver = {
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.name = "xhci-histb",
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.pm = DEV_PM_OPS,
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.of_match_table = of_match_ptr(histb_xhci_of_match),
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},
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};
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MODULE_ALIAS("platform:xhci-histb");
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static int __init xhci_histb_init(void)
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{
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xhci_init_driver(&xhci_histb_hc_driver, &xhci_histb_overrides);
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return platform_driver_register(&histb_xhci_driver);
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}
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module_init(xhci_histb_init);
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static void __exit xhci_histb_exit(void)
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{
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platform_driver_unregister(&histb_xhci_driver);
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}
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module_exit(xhci_histb_exit);
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MODULE_DESCRIPTION("HiSilicon STB xHCI Host Controller Driver");
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MODULE_LICENSE("GPL v2");
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